US1333761A - Can or jar and its closure - Google Patents

Description

W. A. LORENZ.

CAN 0R JAR AND ITS CLOSURE.

APPLICATION FILED AUG-7, I916.

1,333,761 Patented Mar. 16, 1920.

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WILLIAM A. LORENZ, OF HARTFORD, CONNECTICUT.

CAN OR'J'AR AND ITS CLOSURE.

To all whom it may concern:

Be it known that I, WILLIAM A. LORENZ, a citizen of the United States, residing at Hart-ford, in the county of Hartfordand State of Connecticut, have invented new and useful Improvements in Cans or Jars and specification.

This invention is an improved form of can'or jar and closure, which although intended and adapted for general use is especially useful in connection with such containers when hermetically sealed in connection with the hot processin of their contents. .In,such processing the container is a filled with its contents, and the sealing gasket and cover are placed in position, the latterbeing clamped, or held in position, to prevent the displacement of thecover or the contents of the container in the processing, or in the handling incidental thereto, and

also preventing. the return of the air during the cooling, after the processing operatlon,

so as to obtainfuller effect of the atmospheric pressure upon the top of the cover, to make a tight seal. a

With the cover thus held in a closed'posi tion upon the gasket during the processing operation, the steam or air generated under pressure by the heat of the operation must escape past the gasket. In those types of containers and closures in which the gasket" rests upon a horizontal shoulder of the contaTiner, the permanent or detrimental displacement of the gasketby the escaping pressure, is obviated to some extent by the direct support of the shoulder, and also by the resistance of the gasket to being stretched in a horizontal plane to a suflicient extent to carry it off from itsseat on a relatively wide horizontal shoulder, or to a point from which its'own elasticity will not restore it to sealing position after the pressure ceases. But. in other.- types of containers now in commonuse Where the gasket projects beyond its supporting shoulder of the container, and especially where the gasket is inclined at-an angle across a conlcal or rounded shoulder of the container, 'and is sealed by a wedging pressure of .a conical cover exertedobhquely toward the shoulder of. the container, there is a decided tendency for' the steam and air, escaping under. con- .siderable pressure, to move the gasket downwardly; and displace it from its seat. Such pressure, following Specification of Letters Patent. Patented Liar, 16, 1920. Application filed August 7, 1916. Serial No. 113,418.

. a conical or wedging form of closure is shown 1n U. S. Patent No. 826,105 of July 17, 1.906 (Figs. 7 and 8). In this general type of wedging closures, which are adapted to create and maintain a firm and certain seal, there is, when employed in the processing opera-tion referred to, a pronounced tendency for the escaping steam and air to displace the gasket downwardly from its.

proper sealing position, sometimes to the exreferred to.- The drawings show in large scale one side of a container and its closure in elevation, the cap or cover and the gasket In Fig. l the being shown in cross-section. gasket is shown to be only'slightly compressed by the cover, in the position occupied during the processing operation, while Fig.

2 shows the same parts after the gasket has been fully compressed by the atmospheric a successful processing and seallng operation.

The container 5 is provided with a beveled or rounded shoulder 6 for seating theigasket 5 and receiving the sealing pressure of the gasket 7. Below that shoulder the neck of the container is enlarged at 8 so as to nearly fill the rim or flange of the cover 9, the lower edge of which projects below the said shoulder or enlargement, suflicient space being left between the sealing shoulder 6 and the enlargement 8 a rentrant contour to allow for receivlng the projecting or overhanging portion of the gasket; The enlargement belowthe sealing shoulder 6 may be in the formof a. semi-rounded shoulder,

v as shown in the drawings, or it may be otherwlse shaped to su t, theex gencms of manufacture, the essential provlsi'ons'being to'allow suitable space by the rentrant contour above the joint at 8 for accommodating that portion of the gasket which isoutside of and below the sealing shoulder 6, while substan:

tially filling the rim ofthe cover, belowthat space. The joint'thusimadefat 8 prevents any portion of the gasket from being forced out through that joint to a detrimentalextent during the processing operation, which takes place prior to the sealing operation,

This invention is therefore herein shownm I r and while the gasket is held to its seat only by its own elasticity and by the comparatively slighlt pressure of the cover u n it In operation, the container is -fil ed with its intended contents, the gasket and cover are placed in position, and the cover s clamped or held approximately as shown in Fig. 1, in which the holding means is a temporary spring clamp or clip 10, bearing upon the top of the cover, with its ends extending beneath any suitable collar or shoulder 11 of the container forming a seat for the clamp.'

While in the condition shown in 1 the jar and its contents are subjected to the processing operation, in which the 'con ents of the jar are heated, thus eX-pandingt'e confined air and gases, the pressure of which acts against the under side of the cover, raisingit against the opposing pressure of the clamp 10 sufliciently to allow the air and steam to escape past the sealing seat. For the best'results, the downward pressure of the clamp only .made suflicient to insure making an air-tight sealing joint at the close of the processing operation, and while the jar contents are cooling and beginnin to contract, so as to prevent therentry .o the" air at that time, thereby preserving whatever vacuum may be obtainable by the cooling and contracting of the contents. Increased pressure from the clamp "would correspondingly increase the resistance to the forcing out of the expanding air and gases,

and thus result in a lower vacuum. On the other hand, nsuilicient pressure from the clamp would be liable to leave' 0 enings between the cover and gasket sufliclenrt to permit the reentrance .of the air afiterprocessing, it being difficult to manufacture the jar and the gasket and (the cover so accurately as to produce aperfectly smooth and airtight joint entirely around thegasket by the mere, weight of the cover.v On account of ment 8" below the gasket fills and fits the,

these unavoidable variations in the. parts forming the joint, it will frequently happen that the gasket-joint is closed less firmly at some portions than at others, and the looser,

portions of the gasket are liable to be forced out'by the pressure of the escaping air and gases away from the sealing seat, and even entirely out from between the cover rim and the jar, thus precluding the subsequent sealing of the jar. The shoulder or enlargea lower rim of the 'cover sufliciently to prevent the gasket from being displaced far enough to impair its'sealing functions,- thus forming a sllp joint, or telescoping joint, which is sufiieient y close to prevent the entrance and extrusion of the gasket, and is sufl'iciently long to allow of the telescopingmovement of the cover rim :during the processing and sealing operations.v Under these conditions the escaping pressure finds its way out at the point of least r'e sistanee bepress the gasket between them at an angle substantially along the line indicated at 12, thus pi nching the gasket at-that'angle approximately around its middle portion, extruding the marginal portions of the gasket above and below the shoulder 6 into the spaces there provided for this overflow of the gasket material. The atmospheric pressure continues permanently, so-that the temporary clamp may be removed.

The proportions herein shown' for the various parts are based upon the experience of r actual practice. It will be understood, however, that the proportions may be varied andthe parts otherwise modified within the scope of the appended claims.

I claim as my invention 1. A container having ,a sealing shoulder for receiving a gasket, a gasket on said sealing shoulder; and a cover having a depending flaring rim, extending past the sealing shoulder and the said gasket in sealing relation thereto, and also forming a slip joint with the container below the sealing shoulder, with'an annular space between. thesealceiving an'edgepf the gasket. 2., A container having a sealing shoulder for receiving a gasket, a gasket) on said ing shoulder and the said slip joint for resealing shoulder, a cover having a dependpast the sealing ing flaring rim extendin shoulder and the said "gasket in sealing rela- 'tion thereto,and also forming a telesc'o ing joint with the container below the sea ing sealing shoulder and the said slip joint for receivm an edge of the gasket, and' means for yiel ingly holding the cover in contact with the gasket. V r

3. A container having a sealing shoulder for receiving a gasket, a gasket on said sealing shoulder, a cover. having a depending flaring rim extending past the sealing shoulder and the said gasket in sealing relation thereto, and also forming a slip joint with shoulder with an annular space between the rthe container below the sealing shoulder with an annular s ace between the .sealing shoulder and the said slip joint for receiving an edge of the gasket, and a temporary clamp for yieldingly holdingsthe cover uponthe gasket, the container being provided seat for receivin the said .dlamp.

with a .ILLIAM A. LoRErIz. i

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